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RECENT POSTS IN THIS TOPIC

John R. Cox: on 2/25/14 at 2:59am UTC, wrote I suspect that the solution to practical quantum computing lies in...

Eckard Blumschein: on 2/11/14 at 15:02pm UTC, wrote "Quantum Computers Get Real"? Since they were too often claimed to already...

Domenico Oricchio: on 1/23/14 at 14:01pm UTC, wrote The problem that I see in the quantum calculus is that there is not scale...

Robert McEachern: on 1/22/14 at 23:41pm UTC, wrote "Put two or more qubits together and new interactions begin to emerge that...

Robert McEachern: on 1/22/14 at 22:56pm UTC, wrote "how far are we from a fully working quantum computer?" A long ways. Here...



FQXi FORUM
March 23, 2017

ARTICLE: Quantum Computers Get Real [back to article]
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Robert H McEachern wrote on Jan. 22, 2014 @ 22:56 GMT
"how far are we from a fully working quantum computer?" A long ways.

Here is a Classical QuBit coins that are entangled, but not in any definite state, until an axis of observation is chosen, and the observation is made. The pair of coins is fundamentally different than the more familiar pair of gloves, that is usually discussed. A real glove, with the fingers curling towards the palm, is indeed in a known state before being observed - it is KNOWN, a priori, that a right-handed glove will be identifiable as such, REGARDLESS of what angle it is eventually viewed from. But the same is not KNOWN about a coin - it is not KNOWN, a priori, that a coin, viewed from every angle, will always be "heads".

Unlike "handedness", which is indeed an attribute of a glove, "heads or tails" is NOT an attribute of a coin. It is an attribute (like spin and polarization), of the relationship BETWEEN the observer and the observed.

Rob McEachern

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Robert H McEachern replied on Jan. 22, 2014 @ 23:41 GMT
"Put two or more qubits together and new interactions begin to emerge that have no counterpart in our everyday world..."

It may have no counterpart in a pair of gloves, but there is a direct counterpart in a pair of coins.

Rob McEachern

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Domenico Oricchio wrote on Jan. 23, 2014 @ 14:01 GMT
The problem that I see in the quantum calculus is that there is not scale reduction in the elements: when there is the first computer, the system start with vacuum tubes (great eniac), then medium Transistors Computer, then the first little chip intel 4004; it was many years to reach the actual solution.

If the starting point is a little-scale quantum computer, then the solution is not immediate, there is not a technological evolution; there are large scale quantum effect, like quantum drum, Josephson effect, superfluidity, superconducting quantum inteference device then some of these effects can be used to obtain a large scale quantum computer (coarse not-micrometer effect with great magnetic quantum fluxes without quantum chip).

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Eckard Blumschein wrote on Feb. 11, 2014 @ 15:02 GMT
"Quantum Computers Get Real"? Since they were too often claimed to already work in principle and getting available very soon for many years, I rather suspect desperate cries for funding. Maybe, I don't correctly understand entanglement and decoherence of two particles. So far, I admit failing to believe in mixed states.

Eckard

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John R. Cox wrote on Feb. 25, 2014 @ 02:59 GMT
I suspect that the solution to practical quantum computing lies in continuous function as the interpretation of a divisible quantum. The Bohr dictum assumes that because each of any wavelength of EMR carries the Planck Constant quantity of energy, the 'quantum leap' must also occur as its progenitor. Perhaps the quantum is more the result of spacetime differentiating a continuous change in energy out flow from a matter state seeking to maintain an optimal balance of energy to volume. jrc

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